Entergy Corporation

From 5,000 feet up, it's difficult to make out where Louisiana's coastline used to be. But follow the skeletal remains of decades-old oil canals, and you get an idea. Once, these lanes sliced through thick marshland, clearing a path for pipelines or ships. Now they're surrounded by open water, green borders still visible as the sea swallows up the shore.

The canals tell a story about the industry's ubiquity in Louisiana history, but they also signal a grave future: $100 billion of energy infrastructure threatened by rising sea levels and erosion. As the coastline recedes, tangles of pipeline are exposed to corrosive seawater; refineries, tank farms and ports are at...

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From 5,000 feet up, it's difficult to make out where Louisiana's coastline used to be. But follow the skeletal remains of decades-old oil canals, and you get an idea. Once, these lanes sliced through thick marshland, clearing a path for pipelines or...